Ribbon spool



R. ATWOOD RIBBON SPOOL Dec. 22, 1936.

Filed Aug. 22, 1935 INVENTOR 248x w W: g

ATTORNEY UNITED STATES PATENT OFFICE nIBBoN sPooL Rawson Atwood, Brooklyn, N. Y., assignor to Decorated Metal Manufacturing Company, Brooklyn, N. Y., a corporation of New York Application August 22, 1935, Serial No. 37,295

2 Claims. (Cl. 242-711) This invention relates to improvements in wound upon the spool and holding it in that spools for ribbons and the like and particularly position during the unwinding and use of the but not limited to spools for ink ribbons used in ribbon, the fact being that, when the projection typewriters, business machines, etc. b is forced into the socket c from the position According to common practice in the use of in which it is shown in Figure 1 to that shown such spools in such machines, the spools themin Figure 2, the projection b will be forced into selves are supplied by the manufacturer thereof the socket c and interlocked therewith and the to ink ribbon manufacturers, who in turn wind ribbon end clamped therein, as shown in Figures the ink ribbon thereon and supply the unit (spool 2 and 3. For the purpose of such interlocking and ink ribbon) to the users of the machines. and clamping, the diameter of the projection b Such spools must be sold at a very low price is slightly larger than the distance between the as, according to the usual practice, the spools upper ends of the socket so that when the proare thrown away after one use thereof. For this jection is forced into the socket, it and the ends reason they must be produced at a very low cost of the socket will yield in passing each other 15 of manufacture. Furthermore, re-use of such because of their resiliency and then snap into spools is very undesirable from the point of view engagement at a point above the centre of the of the ink ribbon manufacturer because such reprojection and thereby lock it frictionally against use may result in the winding thereon and use accidental or unintended separation from the therewith of other ribbons inferior in quality toV socket. The fit of the two will not only effect those supplied by him with such spools. such interlocking but, in doing so, clamp the rib- 20 It is the object of the present invention to bon end tightly between them.

provide a spool which will meet these conditions. What I claim is:

In the accompanying drawing, 1. A ribbon spool of resilient sheet metal hav- Figure 1 is a cross-section of a spool embodying a longitudinal slit for receiving the ribbon 2, ing the present invention showingthe same open end and at opposite edges of said slit having for the reception of the end of the ribbon to be coacting means adapted on the application of Wound thereon; pressure of one towards and into engagement Figure 2 is a similar section showing the same with the other to interlock and clamp the ribbon closed With the end of the ribbon secured to the end to the cylinder, said interlocking means com- O spool; and prising a projection on one edge and a socket on Figure 3 is a perspective view of the spool the other for receiving it. with the ribbon wound thereon. 2. A ribbon spool of resilient material having a Referrng to said drawing, the spool a, which is longitudinal slit for receiving the ribbon end and of resilient sheet metal, is slit longitudinally and at' opposite edges of said slit having coacting is bent at one edge to provide an inwardly promeans adapted on the application of pressure of jecting tubular portion b and at its other edge to one towards and into engagement with the other provide a socket o for the reception of and correto interlock and clamp the ribbon end to the sponding transversely in Shape to the projection cylinder, said ;interlocking means comprising a b. These two members b, c, constitute the means projection on one edge and a socket on the other for looking the spool in closed position and in for receiving it. 40 doing so clamping the end of the ribbon to be RAWSON ATWOOD. 

